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X9428YV-2.7 Datasheet(PDF) 5 Page - Intersil Corporation |
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X9428YV-2.7 Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 20 page 5 FN8197.0 March 8, 2005 Figure 3. Two-Byte Instruction Sequence The Increment/Decrement command is different from the other commands. Once the command is issued and the X9428 has responded with an acknowledge, the master can clock the selected wiper up and/or down in one segment steps; thereby, providing a fine tuning capability to the host. For each SCL clock pulse (tHIGH) while SDA is HIGH, the selected wiper will move one resistor segment towards the VH/RH terminal. Similarly, for each SCL clock pulse while SDA is LOW, the selected wiper will move one resistor segment towards the VL/RL terminal. A detailed illustration of the sequence and timing for this operation are shown in Figures 5 and 6 respectively. Table 1. Instruction Set Note: (7) 1/0 = data is one or zero S T A R T 0101 A3 A2 0 A0 A C K I3 I2 I1 I0 R1 R0 0 0 A C K SCL SDA S T O P Instruction Instruction Set Operation I3 I2 I1 I0 R1 R0 X1 X0 Read Wiper Counter Register 1 0 0 1 0 0 0 0 Read the contents of the Wiper Counter Register Write Wiper Counter Register 1 0 1 0 0 0 0 0 Write new value to the Wiper Counter Register Read Data Register 1 0 1 1 1/0 1/0 0 0 Read the contents of the Data Register pointed to by R1 - R0 Write Data Register 1 1 0 0 1/0 1/0 0 0 Write new value to the Data Register pointed to by R1 - R0 XFR Data Register to Wiper Counter Register 1 1 0 1 1/0 1/0 0 0 Transfer the contents of the Data Register pointed to by R1 - R0 to its Wiper Counter Register XFR Wiper Counter Register to Data Register 1 1 1 0 1/0 1/0 0 0 Transfer the contents of the Wiper Counter Register to the Data Register pointed to by R1 - R0 Increment/Decrement Wiper Counter Register 0 0 1 0 0 0 0 1/0 Enable Increment/decrement of the Wiper Counter Register X9428 |
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